Physics P1 Capacitor

[Keeemoman]

Hey guys I am telling you all the correct answers
For the lamp one it was all on
For the capacitor it was time delay and store energy
For the first one it was 66m
For the transformer, it was the coil to your left as it was step down transformer
But what annoyed me was that they were comparing the baby's weight with the box but the answer was less than W
For the pressure it was the atmospheric pressure same as the heights were the same.

If you want mre ask me

 

[adityar]

I totally disagree, how does energy come to a capacitor?! It holds CURRENT by storing a potential difference...

 

[Aahmsil]

Capacitor

I totally disagree, how does energy come to a capacitor?! It holds CURRENT by storing a potential difference...

http://en.wikipedia.org/wiki/Capacitor

 

[adityar]

You got them SOOO wrong...
Capacitor-store CURRENT
the coil is to your RIGHT 'cause that was a step-down transformer, and the smaller coil was the left one

 

[adityar]

Re: Capacitor

I totally disagree, how does energy come to a capacitor?! It holds CURRENT by storing a potential difference...

http://en.wikipedia.org/wiki/Capacitor

Wikipedia says it holds charge
CHARGE=Current x time

CURRENT, NOT energy

 

[Aahmsil]

Capacitor

I totally disagree, how does energy come to a capacitor?! It holds CURRENT by storing a potential difference...

http://en.wikipedia.org/wiki/Capacitor

Wikipedia says it holds charge
CHARGE=Current x time

CURRENT, NOT energy

A capacitor (formerly known as condenser) is a device for storing electric charge. The forms of practical capacitors vary widely, but all contain at least two conductors separated by a non-conductor. Capacitors used as parts of electrical systems, for example, consist of metal foils separated by a layer of insulating film.
A capacitor is a passive electronic component consisting of a pair of conductors separated by a dielectric (insulator). When there is a potential difference (voltage) across the conductors, a static electric field develops across the dielectric, causing positive charge to collect on one plate and negative charge on the other plate. Energy is stored in the electrostatic field. An ideal capacitor is characterized by a single constant value, capacitance, measured in farads. This is the ratio of the electric charge on each conductor to the potential difference between them.

 

[adityar]

Dude,
You are contradicting yourself. You just said "A capacitor (formerly known as condenser) is a device for storing electric charge" meaning you agree that it is related to do with current, not energy.
Q=It

 

[Aahmsil]

Capacitor

Dude,
You are contradicting yourself. You just said "A capacitor (formerly known as condenser) is a device for storing electric charge" meaning you agree that it is related to do with current, not energy.
Q=It

Electric current is a flow of electric charge through a medium. This charge is typically carried by moving electrons in a conductor such as wire. It can also be carried by ions in an electrolyte, or by both ions and electrons in a plasma.
The SI unit for measuring the rate of flow of electric charge is the ampere, which is charge flowing through some surface at the rate of one coulomb per second. Electric current is measured using an ammeter.
http://en.wikipedia.org/wiki/Electric_current

 

[haochen]

yeah even in the book "IGCSE PHYSIC"
it is written
"a capacitor is used to store electric charges"
so its not current !!!

 

[Aahmsil]

Capacitor

And you're jumping from one mis-conception to another.
Take for example; F=ma
Do you call Weight a mass just because it is co-related with mass in a formula ?

 

[haochen]

Aahmsil is right
u use the formula only to relate the thing together not their meaning !!!

 

[adityar]

Fine...

 

[haochen]

clearing one student's doubt is time taking
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no offence

 

[mido4help]

yeah even in the book "IGCSE PHYSIC"
it is written
"a capacitor is used to store electric charges"
so its not current !!!

It's simple as you put voltmeter across it after charging the capacitor it will read volts so it stores energy.

 

[haochen]

if u put ammeter after the capacitor what will happen ???
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ammeter will read zero because it took all the charges so no charge wll go to the ammeter

hope u understood (one of paper 3/6 question)

 

[markiola]

The examiners come up with new answers every year. Same question, different year, different answer. This not BUENA!!

 

[haochen]

its euro!!!

 

[Rizwanjubail]

guys see paper 1 october november 2001 number 30. and see the markscheme, it says store ENERGY

There is no such question in oct nov 2001 related to the capapcitor....